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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b259e6ef76688384d696f24948d7d841ea8dc35fb24187ebac656b34b0d48029' 
  AND token = 'LaO4ufKhn5pQWnuwvxAMTxd+4ujlb1XqF2oMoBW22X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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