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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6270c64f8f81ccaf07a3bac551b9e6415029d48b0a70d1082b8e3b6cbd8fce9b' 
  AND token = '+xeVVBeo91p8r1ypS6/NU0J3SvNpMDlOGV/YqvW9uC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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