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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c7d88f39fdb0f51bee984ba6fc050f5bdbe355602b90c68df6dd0bfcedb3f8' 
  AND token = 'cDVK0bq43oXnDUM/9a2Rk95MCwunQKm+64iN/tmAJmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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