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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcf73320fe022f27ad56b5590ff80d36b673afe2aa19d720917f645876e0dc39' 
  AND token = 'sdBGivQtzAY9RB46wQ5rnKFIIq4r0iiG9wZ7ssUOIR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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