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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f89f3e3173a942b210cdc6020cd4da92d84a7546584bd4a5289bf3694c275ccb' 
  AND token = 'yWbH33U4O8cnEl6yhiDyJjdGCZv14xGjeo9XLAECyN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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