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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03ab661b7b4e7675796a6b0e80c9f5005ea7169803972e5fd140b50c937d492' 
  AND token = 'gyIs/rSjQW/k4heoQJ97PrWpfwn1S33N0cCsqgHYzi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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