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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e8a9ed26494456d3b6dac307ac1720db68879f3b5ebe4b390e59165b7d676d' 
  AND token = 'VMRigaEgNu49HnT/Byx0tz7ieJxXzojnyofmzUgMa4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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