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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92859b442c571c1bec80fc2cad913908d92f276d8c7a843bcbc219ee39a7565f' 
  AND token = 'GoB1MBTLCnY9QWrwaog2N8kN11BRwKhAP+48cBTDlqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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