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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6fd0f5e2e77feff7ad35e9411fb52020a832808e766e811d25533e985b7a2ad' 
  AND token = '8Nsdq18IajhmjB4Ei2qBnKeyj1nsq2J9O/t0g/BNRYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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