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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669b5ff5d82b38c1b6469634ddd86fac3697a2838e17b71ba92274cf992f0ead' 
  AND token = 'zTdGTvQug/uwkMulL2uewX9lk32TMCPT0V+8SFPgrnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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