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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f87eb11c67c7296399bbe50ace6a716e14cd00ae522d96d94373d9296049fbff' 
  AND token = 'Sl2GRoZewL9gz1XFaqrhRSTfL6ErJVJ3T0SCFvNjfX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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