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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '851f4b087475d0d9ae48be8e49f0dd9ed52ee8976dbc105dd6bf9eace9047058' 
  AND token = 'Ovlnn+YBEMHzIXXjWeiANmqHydqlwfaCDDAK2Eq9B3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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