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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98dbc58bb96cc2f9b16054f096f0db5d7dfdf186a481336064d3f81cbaa623e0' 
  AND token = 'PeaqWJhxzfsZFZ/zFB8RXl05KMwvZ8zS5o6o2emoZRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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