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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '633036d60a474aff1a4d96e03c725f3379e170539074a308449facbcdc80b9f9' 
  AND token = 'dUe/XfEiK2vTbbwzqmzncncuH6EbL86j4jdBQ6aNt/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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