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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dced8e9efc2db99dafe8a6b0ccbfcc887dbfb9332deb6fc8dc472f2c5f4f4659' 
  AND token = 'Ef1dqrQUQOvKt1Y2LlVz+4SPnlws+Q/GLS673LUXDKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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