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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b66c5c3b65ae6c4931c7b60b8549c5711a5a1e54ee65752f9bfb9d310a3d791f' 
  AND token = 'YYvdeEMTBD5+u8suxNjE2vgDIJsj2BuV9xeMEgro1D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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