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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ea32555f77bc77bef821fcd4166788cd0205f3118bf445cd1347420a466d28' 
  AND token = '6CCSm6IuOCGKsvkPo7eTa+ehJerZe2tX+jQ4mQPIiDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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