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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0decf264ad02a4b95091eb64113bd6067e998e7ae9c87b15f499cca9851d1f13' 
  AND token = 'ba1QKmgmU32UkflJo5x2XQY+PAezoLOX0QaFaKuby2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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