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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01f8952fa4da9d4c732bb090da0096e26c700cedd7e6a494c91ab603ba5611a8' 
  AND token = 'QGEs7yRX5vxVj1SP0OZkNxoxLzRmrf7IeVXi+djDQ4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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