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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dda5144f179f8d06d44c624695d04f1004b6fab2ded390bd8fcc90317b19e53' 
  AND token = 'vDoXgaah7hfq+lf9av5fpkb5iibfgt9CpD/gWP7wrHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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