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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6affc339a2d4a7ac70d45f2e73c04ad510afcf05db2f27ce8bbbcac16b265d35' 
  AND token = 'ymuACr7/9Ee7InD91dRMsbHgbNA+B2KKED/nAJ5anqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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