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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2184ba94676517de263d9af602e4ff4f221d086726175131acde6b7e90949686' 
  AND token = 'fv4QozBMN2d24l28N+v9L2JLtpnmj6k3eR7TnOQPesk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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