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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57fef42a36e740db6a3e0103a411f4500efda76a2001e8780004edf3f42a81d0' 
  AND token = 'd3k4gmStSYOQ7vGanH4G2ZV1DLpcNxt3CisIXCOe528=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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