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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '309de26fd437a7e97c609d8b21a76ee131a0e7637e396490f747d146ff064553' 
  AND token = '3IbF30/f1VNMiZ9siGpxQsZFmQOOfiU7QZYE7fch3xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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