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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7551ba7bbfd72fffbc038aa53c8a6e37091be64e17df7b952f6dc7270dfd8522' 
  AND token = '2xkismNv7yXtE43/4EQHeZ5GNszO6336VnF3tJlhkJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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