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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87efc4849c55aa78c75733b4ccfe9b6b1efdd1241d0425d2ee8d52a1eaf065b2' 
  AND token = 'wbloOpxUGUbU+V9FBEtJ340qq1s639xgaPkgoRL8cqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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