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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb458b9b8f8b6efd45e3a6049f04d606726ecddbbfaaaf180f03e653598ae45b' 
  AND token = 'kznpd/eML1t286dyKF74SICCbfHVHlwdfXT5kiPK2YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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