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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '918415c8253d4f6dbfeef35c99cb47177dd3899c22a875fb3c393a9b311a6a7f' 
  AND token = '1R8oXSOPu5ow0eP8rps7ZHc/WKsLQ8aX/hdSPSiRJO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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