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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c206eed21685e1e7c7c6d84841fbf8443c06ae75a460476451f119c75163f053' 
  AND token = 'rI6jb4bxYgw7wcuhbs3HIrzWdpQQ5ewcVHihkjn/eoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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