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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a96fb34357f7a6bbf3be3fac6ab74c174f4701df61b6ccd53e17ed9cb10e30' 
  AND token = 'ehpIZfKvDNDqgIjzdeVY+AUixD+bZSnL4fWj2wVQves=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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