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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a41599f75f4b0b2a94add16ef3855abd3cfe4af1da934603bc2588db58dc02a' 
  AND token = 'SCwmFw7JEYJpt72ocHMyquIoS+71ZWrDFtEU5D6edIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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