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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d74e53fd4fd0b48aff3ab88c29058a36ed3d6e2f2f11f3ce57e8724cd85897' 
  AND token = 'kn2YWblSGlN6d8jM2ZMMqk3w9z5A5qsonpNNZnXEp7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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