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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '955e500cb62302ec8ef5d23aba976a5b3fd975f25d9f2a391b1190b79d5774a7' 
  AND token = 'UOaeeyGVZbVgczvu5YdM2vWzWaxjigfg2Px9EJVRdG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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