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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb64378b1ccd6219d3dc7027527844c32e69bffab915601ece375a282e8ef0a3' 
  AND token = '28frr+fZwAyWbwQ0z7r0wAb8ryOl63RfYWghEpCWIqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}