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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4b453997dcc9190a2f662e7137f17fdb8837f854f1a7fb3a7c67db574a88b0d' 
  AND token = 'dy/kmRqpTWsccIbLTqBK2GCaiLiderIUK3pGN5PQeH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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