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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da9ef42b9a2c00fd3caa87bd8116416600d49b9d690e664ca5ce486802932c98' 
  AND token = 'DgdJE1Z9kXK8PF/oOQprtJLXt++305G7D4C+BKahSVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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