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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '624f933e0405466e802d20ec7956bd8c7de0c4bcaf8b146f39a8236499dc930c' 
  AND token = 'N95dJYdaQyNspCZUNpnaZYL1y8WbvCDkTOzwPPGhORk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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