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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '003b3ec17ee34ab6e14bbad59c3cfd3a5f6af57caae1a9af5e827fd6e97f7080' 
  AND token = 'pXMMtMpMZyFVrdo3o/SXRSuHpqECMG7A44FBt27dF7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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