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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4474e86f64dff9e5e620f3d6020346ff402190c81895302078df693bf1c24b7' 
  AND token = 'xD+Jkm6foLkNE1WorAV+7dMIEkxyK7QhC++bweANeqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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