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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa6beaf1bcb7f6ec8fc73bf863520b3410456164ec37074c683b1db454a6e88' 
  AND token = '7RTiojTJsmZlK/RoSxqGm5CU4CI880DdOVbcqKRqpaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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