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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cd8dcf1dc86345bea57ddf560477fb9b3c3f71c0524660d34bedec58e2c933b' 
  AND token = '3JfXPtFBpwleCnFni8cOkhF7/zEZekBqxT/5XdVqrUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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