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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb2df1de36dc5ebf74103669ec70d0e346d9f3e80454ac1149400b644787d3d9' 
  AND token = 'BpvJvEIO2SGcTachGC6LUoef9+ZHE/95PWjg/leN/wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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