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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beca409cb1a575f16d9b5e875d5393f03e6b87ca9b5bbac0a08d26471aa7452e' 
  AND token = 'aQT19YPT7P6Ay+1J2vtZXN8kYqvW/TTZ+yr8hRilW1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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