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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24df50f44cafc68546dd6e48d52d5fc6781d6ac26582c8708f7f7922a9ba199d' 
  AND token = 'L7w/rA4V8j7jdlEzyTG+ZZ6d1fqLRtPwtAtfcg/rvu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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