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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f5c8b4239afde78c0baf63d55de239e7f1ecf265a36f84e301cab6ca3197ef2' 
  AND token = 'u8r2QmHNV+83bl4QCJ2VVAyGYm0mQoCbWv/X2B8VEoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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