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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae369f3765c8a388a0e64759020d5c9834e92e540233b0a8a31a711187d25fe' 
  AND token = 'WOTllZaL3oT0+pa0lIT9Ph+YZbqZoAymC52Qm+ky+WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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