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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7441ca231dec44d4651e5ab364b546fd51eedff42164ff8303b30ebd0683c524' 
  AND token = '+BFk0lnSijfg5nqT4I9z69rpGNW7gbjSkQ7ZbKmyQNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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