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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fead4fce4897d53a5f3dae815cfa00d21d291d30617bc594aa11999e7bb85406' 
  AND token = 'PJoshVYqa8eisNb4+T83EaAzbs4BoHIOS9TiSRwRU3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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