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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f18dbb74437e831c02e62bcbb0a206b945db472e714e46b51c47041b57e837' 
  AND token = 'M9uAR+vQ8cOEQiXxIgrXCp/nWEMJ1SLJmfWu7lqT/yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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