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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3884570dba84a3a35780b2df23a92bc03d15b5ea51f999d2237832a73157892a' 
  AND token = 'dA27/SjzYUh/3oN6Ckfn2D7fxbpjOLzENDI6Us29hPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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