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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0573e656361417eda938d47c725e59fbb93ccf435d776e07a0f9fff2b3bab99f' 
  AND token = 'iPR/A+yIVs/sXk/LbUjK80rT80xy4xJxysc205MnGNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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