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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd602dde552f0bd77f8327cd188bbf31e839f9ca7d682f2a85688423b2e75d2f4' 
  AND token = 'evjIF5ZP1bEoG6LEQquSmE2Y58O1mzQhKlZQSbWh8yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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