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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52825366264246a8abdcff841efa8b194274c6a76b38e8896dbed0695b2eb95e' 
  AND token = 'YMnmvewg11QHr2NN6xMbHVWis9S9pdKSFgo8FMZjjZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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