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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3824e7bfd30cde9e8285260e7b207a6342a509fe8064b71556bd839442b50a73' 
  AND token = '+s59Z47ObKpVziLvLpd45ECUuQFwaO9hE0TDhDb9Eek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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