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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd04a3569902798d93ace055e6ac9cb72fbd3c20c7cdad9a67c65b4003e6e3977' 
  AND token = 'MHEgHU7MQAa9IbC0YzUpbvxiGqaPlO5VRP8BU7BrrCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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