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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e71031f421d8f435010b9f7047e5a62e6e86a2f48cd51d353b9e96adf4ad209f' 
  AND token = 'HH4yHmqbpYopIkVIF9Lii5hRBYZMKMi9VDMsyY7CJSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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