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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d52d8a24a233344f71cdbfbfc04ac00aee8228862a98dcfbf02957630b59f36' 
  AND token = 'aEmke94PioiDSq7BsR92JTN8+1nSUNPCwkJqF3V9TzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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