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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d5b3de2464c37fd838a5cb82ce83b37450de429e924fc0292e6a673bb83337' 
  AND token = 'hgP37d4MFfiFPHt4jBq+veCntlm0r1792sm4MVtn4Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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