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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bd804a0dff8e411a71ef1e9e48902380687c4ca353d6b347c9a47a039325f49' 
  AND token = 'CCSQNUEuVrxbTBBuoSb+VHKASP+aYDqVf+XzyT7tL8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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