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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae334d715e3aceef19e03c113e8000a0412f5018a3d76c7205e862d32a963f9' 
  AND token = 'p7D7Z8iXJRSwj4wDS0kYvgK96bQ4gKU4hXr5s1wTD5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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