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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3045175056e4ad674b34fd3e659a629290a6cb1d232031d4af30fec5aab6634' 
  AND token = 'g+0iAG1LVoMpRRwZ042M07VjmHc8Tw1eGFouojWd2Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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