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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd90586793fdd1ed392b8e6526a7ea4b7ad43e41c031fe31ae060667b277e1de9' 
  AND token = '8hoM4yqmOj5cxFZlH+/Ik4WH/oh6e3OBGftSB1B7pcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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