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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8918a680a6b28d9f4a1d02269cdff452a69c82ce368d19e0a57843384453bfd' 
  AND token = 'FR1ApceIyKVEN71APASqY02cJPUJmHuDbofinyOyhmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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