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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9cc22069a1a685ab5a22cfd8c2045ab571eb7fd26e0aa0d6570227793069dc9' 
  AND token = 'IuPDhlnRpttj/Bid7GdRMibgZpsg1URmMr9I6Mh+1Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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